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AssigneeInternational Business Machines Corporation
InventorsWilliam J. Fitzgerald, Franklin Gracer, Robert N. Wolfe
Estimating the term…
The lines representing each edge of each face of each object of a model for producing a multiple object image are segmented at line of sight intersections with other lines representing contour edges of visible faces. Each resulting edge line segment is checked against all visible faces to determine which are visible and which are invisible, and information on visibility is stored together with detailed information on each edge line segment for each object. The model is modified by changing the number of component objects and after each change checking the edge line segments for visibility only with respect to the changes associated with the changed component objects. This results in a substantial reduction in the required number of comparisons between segments and faces as compared to prior methods.
An improved method for producing planar geometric projection images from a computer model by introducing changes comprising the following steps:
An improved method for changing a planar geometrical projection image of a compound physical structure which is comprised of a plurality of component objects having separate boundary faces, the method comprising separately storing information for each object on each segment of each edge line formed by an object face edge, said edge lines being segmented at line of sight intersections with other lines representing contour edges of visible faces, checking each edge line segment against all visible faces to be represented in the image to determine which edge line segments are visible and which are invisible, including information on visibility with the information stored for each edge line segment, and then modifying the image by changing the number of component objects and after each change in number of objects checking edge line segments for visibility only with respect to the changes associated with the changed objects.
Dependencies are inferred from the claim text.